The room is great! As described, it is very well located: It is only a short walk to Lumpini MRT station, but the house itself is located in a very quiet street. There's pretty much everything you need is in walking distance: Plenty of restaurants (western and thai style), pharmacies, 7-Elevens and so forth. With aircon, a private bathroom and a refrigerator, the room features everything I asked for. The room itself and the house are very clean.
Evan is a super relaxed and friendly guy, who is always available if you need help or have any questions regarding BKK.
To make it short: I would book this room again anytime and absolutely recommend it!